172216399950 has 288 divisors, whose sum is σ = 575816716800. Its totient is φ = 36005679360.

The previous prime is 172216399897. The next prime is 172216399987. The reversal of 172216399950 is 59993612271.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 1686039 + ... + 1785261.

It is an arithmetic number, because the mean of its divisors is an integer number (1999363600).

Almost surely, 2^172216399950 is an apocalyptic number.

172216399950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 172216399950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (287908358400).

172216399950 is an abundant number, since it is smaller than the sum of its proper divisors (403600316850).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

172216399950 is a wasteful number, since it uses less digits than its factorization.

172216399950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99296 (or 99288 counting only the distinct ones).

The product of its (nonzero) digits is 1837080, while the sum is 54.

The spelling of 172216399950 in words is "one hundred seventy-two billion, two hundred sixteen million, three hundred ninety-nine thousand, nine hundred fifty".